Computers get viruses the same way that humans do: transmission from one
to another. For computers that doesn't mean shaking hands, kissing or
standing together on public transport, it means things like email
attachments, fraudulent links, downloads, removable media, or any sort
of shared resource. Viruses can even hide in text files like this one.
Like human viruses, they can spread and replicate themselves and cause
damage to their carrier. They normally infect your computer and run
without your knowledge, and are discovered when they show themselves by
way of some sort of computer malfunction. They are created with
malicious intent, to do things like steal your information, but some are
simply created to damage your computer. If you have one, you probably
got it by clicking on a link, perhaps in an internet pop-up ad or a spam
email attachment, or through downloading an infected file. Some advice:
never open emails from Nigeria offering you 50,000 USD deposited in your bank account immediately.
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